Not always the case, it’s up to the prison staff to decide what type of behavior warrants solitary confinement. Based on what I’ve seen in documentaries, for ex

Not always the case, it’s up to the prison staff to decide what type of behavior warrants solitary confinement. Based on what I’ve seen in documentaries, for example both people in a fight might be placed in solitary, victim and perpetrator. It’s also common for political prisoners, “high profile” inmates.